Two cross-country running teams, called the Gazelles and the Cheetahs, participated in a (hypothetical) study in which 50% of the Gazelles and 65% of the Cheetahs used weight training to supplement a running workout. The remaining runners did not use weight training. At the end of the season, the mean improvement in race times (in seconds) for each team was as shown in the table below.

Describe how the results recorded in the table might seem surprising or paradoxical.

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Mean improvement in race times Weight training No weight training Team average Gazelles 10 sec 2 sec 6.0 sec Cheetahs 9 sec 1 sec 6.2 sec